PyCon 2011 - Hidden Treasures of the Python Standard Library - 获得夏时令标识符

本作品采用知识共享署名-非商业性使用-相同方式共享 3.0 Unported许可协议进行许可。允许非商业转载，但应注明作者及出处。

作者：liuyuan_jq

2011-03-30

[title3]datetime.datetime -> struct_time[/title3]

for dt in [ datetime.datetime(2011, 2, 9, 9, 0),
datetime.datetime(2011, 9, 30, 9, 0),
]:

# Convert datetime -> struct_time
time_t = time.struct_time(dt.timetuple())

[title3]struct_time -> seconds -> struct_time[/title3]

# Round-trip: struct_time -> seconds -> struct_time
local_time_t = time.localtime(time.mktime(time_t))

[title3]获得夏时令标识符[/title3]

# The answer is in tm_isdst
# 夏令时标识符
# 实行夏令时的时候，tm_isdst 为 正。
# 不实行夏令时的进候，tm_isdst 为 0
# 不了解情况时，tm_isdst()为负。
print dt, bool(local_time_t.tm_isdst)

[title3]完整代码[/title3]

#!/usr/bin/env python
# encoding: utf-8
#
# Copyright (c) 2011 Doug Hellmann.  All rights reserved.
#
"""Detect whether a datetime value is within daylight savings time or not.
"""
#end_pymotw_header
import time
import datetime
for dt in [ datetime.datetime(2011, 2, 9, 9, 0),
datetime.datetime(2011, 9, 30, 9, 0),
]:

# Convert datetime -> struct_time
time_t = time.struct_time(dt.timetuple())
# Round-trip: struct_time -> seconds -> struct_time
local_time_t = time.localtime(time.mktime(time_t))
# The answer is in tm_isdst
# 夏令时标识符
# 实行夏令时的时候，tm_isdst 为 正。
# 不实行夏令时的进候，tm_isdst 为 0
# 不了解情况时，tm_isdst()为负。
print dt, bool(local_time_t.tm_isdst)